.connection {
  overflow: visible;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: all;
  z-index: 1;
}

.connection path {
  transition: stroke-width 0.2s ease;
}

.connection path:hover {
  stroke-width: 3px;
}